The Times Square bomb suspect Faisal Shahzad has been charged with 10 terrorism and weapons counts in an indictment that accuses him of receiving explosives training and financial help from the Pakistani Taliban.

The indictment returned by a grand jury in a Manhattan court yesterday adds five charges to the original case against Shahzad, 30, the primary suspect in the attempted attack on 1 May. It also details in greater depth his alleged financing, saying Shahzad received a total of $12,000 (£8,000) from the militant group through cash drop-offs in Massachusetts and Long Island.

Shahzad is accused of plotting to build and detonate a homemade gasoline-and-propane car bomb among thousands of tourists on a busy Saturday night. He was charged with attempted use of a weapon of mass destruction among several terrorism and weapons counts.

"The facts alleged in this indictment show that the Pakistani Taliban facilitated Faisal Shahzad's attempted attack on American soil," the attorney general, Eric Holder, said. "Our nation averted serious loss of life in this attempted bombing, but it is a reminder that we face an evolving threat that we must continue to fight with every tool available to the government."

Shahzad's lawyers did not comment on the indictment. Shahzad is scheduled to enter a plea during an appearance in court on Monday. The most serious counts against him carry mandatory penalties of life in prison.

The indictment alleges that Shahzad received explosives training in Waziristan, Pakistan, in December 2009 from trainers affiliated with Tehrik-i-Taliban, a Pakistan-based militant extremist group. The affiliation with the group led to financing, the indictment alleges.

It says Shahzad received approximately $5,000 in cash in Massachusetts on 25 February from a co-conspirator in Pakistan who Shahzad understood worked for Tehrik-i-Taliban. On 10 April he received another $7,000 in cash in Ronkonkoma, New York, which was also sent at the co-conspirator's direction, the indictment says.

US lawyer Preet Bharara said Shahzad conspired with the Pakistan Taliban "to wreak death and destruction in Times Square".

Shahzad was born in Pakistan, moved to the US when he was 18 and lived most recently in Connecticut.

He is accused of abandoning a four-wheel drive fitted with a homemade car bomb in Times Square on 1 May. A street trader noticed smoke in the vehicle and alerted police, who immediately evacuated the area. The bomb never ignited and no one was hurt.

Shahzad was arrested on a Dubai-bound plane at JFK airport on 3 May.

After his arrest, Shahzad co-operated with investigators for several weeks, providing what authorities described as details of the attack and information that led to other arrests. Authorities say he almost immediately admitted his role in the attack.

The indictment says Shahzad bought a semi-automatic 9mm Kel-Tec rifle in Connecticut on 15 March. The weapon was found loaded in his car on the day of his arrest.

It says he contacted the seller of a Nissan Pathfinder in April after seeing an advert on a website. Shahzad met the vehicle's seller in a Connecticut supermarket car park, where he paid $1,300. He also bought components for the bomb in April, it is alleged.

Authorities have said they believe Shahzad acted alone in carrying out the bomb plot after receiving financial and other help from the Pakistani Taliban. Shahzad had returned in February from a five-month trip to the country.

Federal investigators believe money was channelled through an underground money transfer network – known as hawala – but they have said they doubt that anyone in the US who provided money knew what it was for.

Pakistan has arrested at least 11 people since the attempted attack. An intelligence official has alleged two of them played a role in the plot. No one has been charged.

Three men in Massachusetts and Maine suspected of supplying money to Shahzad have been detained on immigration charges; one was recently transferred to New York.